02GF74
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| posted on 21/8/06 at 07:04 AM |
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about cross head screews
seem to rember reading that cross head screw fail SVA and people fill the head with silcone or similar.
is thatright? (I have them holding the curreont for gear leaver and hand brake) 
and the same for button heads? I have many of them, 4 mm, on my bonnet, filling will be a pain to sya the least.
button heads donl;t feel as sharp as cross head -is that takine into consideration?
also does the hight for the head from the surface make a difference to wheterh they are subject to testing or not?
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David Jenkins
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| posted on 21/8/06 at 07:13 AM |
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I use button-head screws to hold down the top of my tunnel. Mine are hex head, but they're the same as cross-head for edges.
My tester didn't look at them twice - I think he ran his hand over them, once.
David
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Humbug
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| posted on 21/8/06 at 07:15 AM |
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quote:
Originally posted by David Jenkins
I use button-head screws to hold down the top of my tunnel. Mine are hex head, but they're the same as cross-head for edges.
My tester didn't look at them twice - I think he ran his hand over them, once.
David
David
I have been looking for hex button head screws (as opposed to bolts)- where did you get them from?
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smart51
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| posted on 21/8/06 at 07:16 AM |
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There is an SVA rule that "features" less than some mm wide don't have to be radiused, just blunted. Think of radiator grilles, you
don't have to use 5mm wire for this.
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David Jenkins
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| posted on 21/8/06 at 07:16 AM |
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From Clerkenwell Screws in London (Clerkenwell Road) - they're a half-hour walk from the office.
Not a lot of use to you maybe, but they may do mail-order.
David
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David Jenkins
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| posted on 21/8/06 at 07:17 AM |
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quote:
Originally posted by smart51
There is an SVA rule that "features" less than some mm wide don't have to be radiused, just blunted. Think of radiator grilles, you
don't have to use 5mm wire for this.
For this sort of thing, I believe that height is the significant factor - 5mm rings a bell, but I wouldn't swear to it.
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02GF74
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| posted on 21/8/06 at 07:35 AM |
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quote:
For this sort of thing, I believe that height is the significant factor - 5mm rings a bell, but I wouldn't swear to it.
yep - that is why I'm asking
thnk it is less then 5 mm though; ok will rtfm.
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02GF74
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| posted on 21/8/06 at 07:38 AM |
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quote:
Originally posted by Humbug
I have been looking for hex button head screws (as opposed to bolts)- where did you get them from?
what diameter/length/material and quantity? (BZP, black or stainless)
my local fastener supplier does a huge range.
& let me know how much you're willing to pay - screws &B postage will be at cost and I'll get them next time I pop into the place
so if you can wait a couple of weeks, then can do.
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Humbug
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| posted on 21/8/06 at 07:55 AM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by Humbug
I have been looking for hex button head screws (as opposed to bolts)- where did you get them from?
what diameter/length/material and quantity? (BZP, black or stainless)
my local fastener supplier does a huge range.
& let me know how much you're willing to pay - screws &B postage will be at cost and I'll get them next time I pop into the place
so if you can wait a couple of weeks, then can do.
ooh, thanks. It will be a while before I can go and measure/count.
Just to clarify, what I am after is button (dome) head screws with a hex hole on top to take an Allen key. Preferably self-tappers. Are they
available?
I'll let you know. Ta
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RazMan
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| posted on 21/8/06 at 08:18 AM |
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I get most of mine on eBay - just do a search for 'stainless button head' and you will find loads.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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02GF74
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| posted on 21/8/06 at 08:27 AM |
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quote:
Originally posted by Humbug
Just to clarify, what I am after is button (dome) head screws with a hex hole on top to take an Allen key. Preferably self-tappers. Are they
available?
deffo button head socket screw, like this:
never seen self-tappers - but a quick search show they are available: http://www.engservfast.co.uk/product_details.asp?cref=secscr
self tappers are usually like the ones here: http://www.aaronsself-tappingscrews.com/Self-tappingScrewsTypeAandAB.htm
[Edited on 21/8/06 by 02GF74]
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ReMan
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| posted on 21/8/06 at 08:41 AM |
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I used Flanged Button heads where visible and contactable, my tester loved them
Like these....
http://cgi.ebay.co.uk/M5-x-12-STAINLESS-FLANGE-BUTTON-HEAD-ALLEN-BOLTS-10-PK_W0QQitemZ8069854401QQihZ019QQcategoryZ25644QQssPageNameZWD1VQQrdZ1QQcmdZV
iewItem
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David Jenkins
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| posted on 21/8/06 at 08:50 AM |
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I'd be wary of using hex button screws as self-tappers - it's all too easy to round off the hex hole (or the key), especially where the
pilot hole was a bit too small, or the material a bit too thick or hard (I used to know someone who was too thick, and hard!)
David
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Dusty
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| posted on 21/8/06 at 09:37 AM |
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If they stick out greater than 1.5mm and less than 5mm they just need to be blunted. 5mm or more and it's 2.5mm radius.
(Theoreticaly if less than 1.5mm they can be sharp as razors)
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scudderfish
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| posted on 21/8/06 at 11:37 AM |
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http://www.modelfixings.co.uk are good for smaller ones.
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